Docker image

I'm using complexity to build a few static sites and have been using it in my CI pipelines. To use it, I needed it in a docker container.

I setup https://github.com/andrewthetechie/complexity-docker to build those images. Right now I'm building images for 3.8, 3.9, and 3.10 versions of python both on alpine and slim images.

If you're interested in a PR, I'd be happy to PR these changes back to this project to have github actions build images right from here.

Start by reviewing the linked complexity-docker repository and its Python 3.8, 3.9, and 3.10 Alpine and slim image builds. Compare those images with this repository's packaging and CI setup, then clarify the supported tags and what GitHub Actions should build before proposing a PR.

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